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October 4th, 2005, 09:19 PM | #76 |
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nasty screen split using ND 1/4
Hello Everyone,
I was shooting test clips today using 1/4 ND, no gain, f4-8, shutter 1/60...I had the dreaded split screen show up in some of the test clips. I had ample light..Is it just me? Has anyone had the same problem? |
October 6th, 2005, 06:56 PM | #77 |
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JVC Service Center/ finally gave in
Okay Guys,
JVC's Pro Division referred me to a 1-800 number for service on the split screen & verticle mid screen red line, got alot of automated messages...very frustrating. I finally gave in and delivered the camera myself to JVC's repair center in Pine Brook, NJ. Strangely, the employee said that although he was told to expect "a batch" of defective cameras, I was the first one to send it in (to their location ??) He said he'd have the techs look at it with an est. wait of 7-10 days.. I'd be very surprised if I get the same unit back....we'll see. |
October 6th, 2005, 07:34 PM | #78 |
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Hmm, interesting. Defective...
heath
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October 6th, 2005, 08:06 PM | #79 |
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Mel, we're all very interested, so please keep us advised on how this goes. Thanks,
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October 6th, 2005, 09:55 PM | #80 |
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I'm glad that folks now are confirming that the amount of light seems critical in this issue.
In my examples, I noted that on a low-light pix (say 0 to 30IRE) verses an adequately lit (0 to 100IRE) pix suffer very different fates if, for example, a tiny 3IRE Black Level error between the L and R sidees is present. In first case, it is a 10% error -- in the second, it is only a 1% error. What can create the such a tiny Black Level error? 1) Not correctly white balancing. If you simply aim the camera at a white wall you may indeed see the split. But upon Manual WB, it should disssappear. And, WB is clearly inaccurate at low light levels which compounds the issue. 2) Gross levels of smear on one side. This is very clear in the sunset shot. No one would use a shot with that much smear. It never should have been published as an example of anything but gross over-exposure. 3) Too much noise -- which is not simply a matter of absolute gain. Some tones more clearly suffer from noise. But, the rule of +12dB, or less, works for me. I can evoke the same amount of SSE at 0dB as at +18dB. I don't think one MUST avoid high gain. 4) Defective units. I keep wondering HOW bad units are getting past QC in Japan? If things can go wrong at the factory -- they can go wrong at the incoming inspection. So it's possible that some percentage of the units will always be defective. (A vertical red line sure sounds like a very defective unit.) Given this, what really counts is that a company will -- without a hassle -- make things right. And, while one can wish things were different, if JVC steps-up the way Canon did, the negative PR will go away as bad units are quickly replaced.
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October 6th, 2005, 10:06 PM | #81 | |
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http://www.time-code-media.de/split.jpg Which sunset shot is it?
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October 6th, 2005, 11:38 PM | #82 |
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I don't see that as a sunset. It looks like the SSE you get when you have not correctly color balanced.
There is a series of shots of a setting sun over a pier where the sun is a ball of super bright light with a mear the width of the sun going downward.
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October 7th, 2005, 01:04 AM | #83 |
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So Mel, you have a NTSC model and have the split screen even when there's enough light? F4-f8 sure seems like enough light.
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October 7th, 2005, 06:18 AM | #84 |
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For those experiencing SSE you should definitely try using only manual white balance (as recommended above) - I have been doing so and it looks very promising at the moment for sharply reducing incidence of the problem. I will keep testing.
Rob |
October 7th, 2005, 08:56 AM | #85 | |
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October 7th, 2005, 12:11 PM | #86 | |
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October 7th, 2005, 12:31 PM | #87 | |
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Any time you get smear that wide from the sun -- the shot is over exposed by definition. To do a sunset correctly one must bias the exposure for the sun which means the beach would be much darker. This guy likely did an AVERAGE exposure. In any case, the shot could never have been used because of the smear -- the SSE was irrelevant.
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October 7th, 2005, 01:04 PM | #88 |
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I remember the shot. The white balance was off as well.
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October 7th, 2005, 01:36 PM | #89 |
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As many of us were (or still are) former JVC HD10 users - I've read this entire thread and thought about the times we all talked about new firmware for the HD10. We really wanted it and asked for it, but never got it. Granted, the "limitations" weren't hidden when we bought the camera.
It's strange, but my HD10 had that horrible streak too...except it was green. It showed up when shooting anything bright like chrome or the sun. I don't think it's to much to ask for them to stop by here more than once a year and talk about their defective or limited products. The only people who deserve beers are the people trying to make a living with defective and limited gear!!!!!!!!!
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October 7th, 2005, 03:28 PM | #90 | |
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Naturally, the higher the pixel count and the smaller the CCD -- the greater probability of smear. It can be any color. Over time, CCD smear rating is getting better and in some more expensive camcorders is now about -128dB. To imply it has anything to do with JVC is, frankly, to reveal a lack of experience.
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